Production of water content detectors, moisture detection circuit diagram
Keywords: moisture content detection circuit diagram
Author: Lu Shi
The moisture content of brick socks is critical to the quality of brick gaskia. If the moisture content of the brick taranil is too much, the stressed brick bar can not code (it is distorted). If the moisture content of the brick sock is too small, the inside of the stimulated brick pads can have a flexible or crack on the blank, and the quality of brick watches in the fire is very poor. And the resistance in the process of pressing the bricks will increase significantly, and the power output of the drive blade is increased. It is therefore uneconomical. The brick sewed mud water content detector introduced to the reader. How much can you quickly detect the moisture content of brick watt, if you fail, you can immediately send a sound and light alarm. Easy to increase or reduce water in the mud worker in the soil mixer. Thus, the quality of the brick tiles pressed from the blanket is desirable.
This brick watt mud water content detector circuit diagram is shown in Figure 1. It is mainly composed of a moisture detection probe, a voltage regulator reference power source, a voltage comparator, a switching circuit, and an acoustic alarm circuit. When the detection probe of the brick watt water content detector is inserted into the brick watt mud. Two detecting the resistance value between the probes will vary with the high and low of the water content in the brick. When the moisture content in the brick bar is within the normal range, the IC2A forward input terminal of the dual voltage comparator (LM393) is higher than the reverse input terminal 2 foot level, the dual voltage comparator. The IC2B forward input 5 foot level is higher than the reverse losing end 6 foot level. Therefore, their outputs 1 feet and 7 foots output high. Therefore, the diodes VD1 and VD2 and the control triode VT1 are closed. Make the alarm circuit uncomfortable. The light emitting diode VL1, VL2 is not bright, and the speaker BL cannot sound.
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If the water content in the brick tile is lower than the lower limit of the normal content. Obviously, the resistance value between the two detecting the probe is larger than that of the normal value, so that the positive source of the IC2A is lower than the reverse input terminal. The output terminal 1 foot output is low. The red light emitting diode VL1 is lit by R4. At the same time, the diode VD1 is turned on, and the control triode is turned on by R6, and the VT1 base is turned on by low levels. → sound integrated circuit IC3 (KD9561) 3 foot wideworthy work → 2 foot output audio alarm signal → R7 plus anger VT2 The base → amplification signal is transmitted by the collector output → speaker BL → reminders and mason people are appropriately increased in the mixer soil. When the moisture content in the brick bar is higher than the upper limit of the normal content, it is apparent that the resistance value between the two detecting the probe will be smaller than the normal value, so that the forward input of IC2B is lower than the reverse direction. The input is 6 foot level. The output end 7 pin outputs a low level. The green light emitting diode VL2 is lit by R5. At the same time, the diode VD2 is turned on. After R6, the control triode VTL base is turned on by a low level, and a sound integrated circuit IC3 is turned on → speaker BL issuance → reminders and mason people properly reduce the amount of water in the mixer.
The component parameters used in the brick gauze mud water content detectors are shown in Figure 1. The resistor R1 to R8 is used with a metal film resistance of 1/2W, and the variable resistor RP1, RP2 is 1 / 2W solid adjustable resistance. The power switch uses a plurality of twist switches, and BL uses a diameter of 2.5-inch permanent magnet electric speakers, and the power supply adopts a 9V cladding battery.
The printed circuit board used by the detector is shown in Figure 2A. The printing plate pad can be drilled with φ = 0.75mm drill bit, and the moisture detection probe uses φ = 8mm steel components to make the front end file according to the size shown in Figure 2b, and Multi-stranded soft insulation wires on the end welding of the tip ends as a probe lead. The probe is connected by a plug and a socket, and the pressure plate behind the probe uses a 5 mm thick phenylene insulation sheet. Two pieces were taken as shown in Figure 2B. Each of the probe elements per plate. The recess is taken in advance by a tensile diameter of the element, and then the three holes are equal to the plate with φ = 3.5mm drill, and then use the φ = 4 mm screw through the holes to fix it.
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After the circuit is welded and the inspection is correct, it can be debugged. First, insert the probe into the mixer and mix the mud in the normal water content (Note: All the measurement must be inserted into the test mud, even if the routine detection is also the same. Otherwise, the measurement results will be extremely error Big), adjusting RP1 and RP2 in the normal content of the mud moisture, the two alarm indicator is not bright, the speaker is silent. Take too little mud containing too little water, insert the probe into which the red water shortage alarm indicator VL1 should light up, and then. Add a small amount of water in the mud and make the water with mud. When the moisture content is just the lower limit of the normal range. Adjusting RP2 allows VL1 to extinguish (try multiple times). Next, in the normal plastic content, a small amount of water is added again and the water is mixed with mud. When the water content in the mud is just more than the upper limit of the normal range, adjusting the RP1 makes the green water excess alarm indicator VL2 just light (also try multiple times), here. The debugging work is end. After the debugging work, the entire printed board circuit and the battery can be loaded in an insulating cassette for a long 8 cm, width of 6cm, and a high 4 cm (insulating box can be made by a thick 5mm plastic plate), speaker, alarm indicator, and power switch Fixed on the upper cover panel, is connected to the printed plate with an insulating soft wire, and the prototype appearance is shown in Figure 2C. To this end. The brick gauge mud water content detector is made, which can be put into use.
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